One method of determining the concentration of hydrogen peroxide (H₂O₂) in a solution is through titration with the iodide ion.The net ionic equation for this reaction is H₂O₂ + 2I^- +2H⁺ $\rarr$ I₂ + 2H₂O
A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution.What is the concentration of hydrogen peroxide in the sample?

Question

One method of determining the concentration of hydrogen peroxide (H₂O₂) in a solution is through titration with the iodide ion.The net ionic equation for this reaction is H₂O₂ + 2I^- +2H⁺

\rarr

I₂ + 2H₂O
A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution.What is the concentration of hydrogen peroxide in the sample?

Quizplus · Accepted Answer

The concentration of hydrogen peroxide in the sample is 5.568 × 10^-2 M. This is because the reaction between hydrogen peroxide and iodide ions is a 1:2 reaction, meaning that 1 mole of hydrogen peroxide reacts with 2 moles of iodide ions. Therefore, the number of moles of hydrogen peroxide in the sample is equal to half the number of moles of iodide ions used in the titration. The number of moles of iodide ions used in the titration is equal to the concentration of the iodide ion solution multiplied by the volume of the solution used. Therefore, the number of moles of hydrogen peroxide in the sample is equal to:```(0.1500 M) × (37.12 mL) / 1000 mL/L = 0.005568 mol```The concentration of hydrogen peroxide in the sample is then equal to the number of moles of hydrogen peroxide divided by the volume of the sample, which is 50.00 mL. Therefore, the concentration of hydrogen peroxide in the sample is:```0.005568 mol / 0.05000 L = 5.568 × 10^-2 M```

One Method of Determining the Concentration of Hydrogen Peroxide (H2O2)in →\rarr→

One Method of Determining the Concentration of Hydrogen Peroxide (H₂O₂)in $\rarr$